Modular type

Help with critique for my first font, a Modular Fraktur

Forums: 

Hello typophiles,

After having sat lazily on an interest in Type Design for far too long, I've finally found the courage (through the help of a course at University) to delve into the wonderful world of fontlab.

I was hoping for some critique of what I've got so far, I have been working with a strict grid system which has worked well most of the time although I'm still having a lot of trouble with the s, z, x and c. Getting the spacing right has also been quite hard, (especially with the extremities on the r and e) and has led me to create a series of Ligatures which I believe solves the problem and adds more visual interest. I set these up as dlig in fontlab because I read somewhere that it was appropriate however, I'm tempted to just put them through as liga. Advisable?